Pneumatic trip.



A. M. BAIRD & H. D. PALMER.

' PNEUMATIC TRIP.

APPLICATION F| LED MAR. 28, 1914. 1,143,346, Patented June 15, 1915.

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W/Znesses A. IVI. BAIRD I H. D. PALMER.

PNEUMATIC TRIP'.

APPLICATION FILED MMI. 28. I9I4.

Patented J une 15, 1915.

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A. IVI. BAIRD & H. D. PALMER.

PNEUMATIC TRIP.

APPLICATION FILED MAR. 28, 19I4.

1 .1 -43,346. Patented June 15, 1915.

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ARCI-IIE M. IBAIRD AND HARVEY D. PALMER, 0F TO-PEKA, KANSAS.

PNEUMATIC TRIP.

Specification of Letters Patent. Patentd Jun@ 15, 1915.

Application filed March 28, 1914. Serial No. 827,950.-

To all whom it may concern Be it known that we, ARGHIE M. VBAIRD and HARVEY D. PALMER, citizens of the United States, residing at Topeka, in the lfrom the gear or clutch, and either another attendant is necessary to operate the clutch or the air which operates the clutch is conducted to the operator by lines of flexible hose for control by him. Furthermore, in the air-actuated devices of this kind heretofore used, there is waste of air bothin uneconomical use thereof and in leakage through the valve.

It is the object of our invention to improve generally upon pneumatic. trips; tc bring the controlling valve and the working cylinder into close relation so there will be a minimum amount of waste in normal operation of the trip; to unite the working cylinder and the valve so as to make the complete device compact, and economical in manufacture; to make the device in such design as to be strong, durable, efficient, and not easily gotten out of order; to. provide a pneumatic trip with a freely working valvethat will not leak and that is controllable by the operator or machine attendant from any of the various positions and distances at which he may be while attending the work to provide in a pneumatic trip a freely working and non-leaking valve that is strong, durable, simple, economical, efficient, and not easily Vgotten out of order; and to provide the parts, improvements, and combinations hereinafter set forth and claimed.

Our invention comprises the parts, im-

our invention in its preferred form and what we deem to be the best mode of applying the prlnclples thereof; but it is to be understood that, within the scope of the appended claims, we contemplate changes in form, proportions, and materials, the transposition of parts, and the substitution of equivalent members, without departing from the spirit of our invention.

Figure' I is an elevation of a pneumatic trip made in accordance with the principles of our invention, the valve proper being shown in sectional elevation on a plane indicated by the line 1 in Fig. II. Fig. II is a vertical sectional elevation on the plane indicated by the line 2 in Fig. I. Fig. III is an enlarged sectional plan view of the valve proper on a plane indicated by the line 3 in Fig. I, with a dotted outline showing position of the working cylinder. Fig. IV shows the trip applied to a power punch.

Similar reference characters indicate similar parts throughout the several views.

3 is the casing formed with a working cyl- .inder 4 and preferably having formed integrally therewith the valve casing 5, the two parts being joined together by the stock 6.

7 is the cap screwed into the end of the cylinder 4i and formed with an elongated chamber 8 for a purpose hereinafter eX- plained.

9 is the piston rod whose outer end 10 is formed for connection with a lever, clutch, or any other part to be actuated by the trip. Shoulders l1 are formed to strike against the cap to limit the return movement of the piston and rod.

12 is the piston; 13 is a leather cup packing which is-air tight; 1li is a washer; and 15 is a nut screwed onto the reduced end of the piston rod to Vclamp the head, packing, and washer securely on the rod.

16 is the air port leading to the pressure side of the piston for admitting air to force the piston inv one direction,-upwardly as shown in the drawings,-and to permit the air to exhaust therefrom; Aand 17 is a compression spring for forcing the piston in the opposite direction. The spring bears between the piston head and the upper end of the housing 8, and the cap is formed with shoulder 18 which limits the working stroke of the piston without undue compressing or injuring of the spring which at its-.maximum stress is held within the said housing.

cylinder, and which is stopped up at its Y Vclose to the lower or pressure end of the working cylinder, and is formed with valve cylinder 19, an air inlet port 20, an exhaust port 21, and a number of small circumferentially alined ports 22 communicating with a counterbored hole 23, which in turn communicates with the port 16 to the working othewise open end by means of a plug 24. rlhe purpose of the passages 22, 23, and 16 is, broadly speaking, to provide a port communicating between the valve and the working cylinder, the plug being provided as an incident to a convenient way of forming these ports and connecting them, and as well as a means of access to the smaller ports for cleaning if necessary. The object in the peculiar arrangement of the three smaller ports 22 will be presently explained.

The plunger or valve proper is Vmade up of several parts as follows: 25 is the slotted projecting end Vto which Vthe operating lever is attached. 26 is a head formed thereon and adapted-to strike against the adjacent end of the valve casing. 27 is a short shoulder fitting quite snugly within the valve cylinder, and `next follows an annular passage 30. Next is another shoulder 28, and then the stem proper is formed as a v threaded rod 29 on which -is mounted the leather cupvpacking 31 and the washer 32,

Vthese two elements being securely held thereon and clamped between the shoulder 28 and the screw-threaded sleeve, coupling, or nut 33,7which is formed with a hexagonshaped middle portion 34. rlhe rodportion 35 of another portion of thevalve proper is screwed into the end of the sleeve -opposite the end into which the end 29 Vis screwed; and the washer 36 and cup packing 37 are securely held and clamped be- Vtween the end of the sleeve and the shoulder 38. The plunger thence extends out of the casing, as shown at 39, is providedV with a shoulder 10, between which and the nut L12 is fitted a sleeve L11. lThe nut maybe 'held from becoming loose by means of a pin d3. 44: is a head for the casing formed-with a'shouldered portion 15 projecting'slightly into the cylinder to form a seat, and also formed with a collar 16. rIhe plunger is made up in this manner, partly for convenience Vin assembling and for accessibility, and partly after described. i Y 47 is a compression spring bearing between the nut L12 and the head dei. i

51 is a bracket formed integrally with the valve casing, and pivoted thereto at 52 is the operating lever 53, the one end of which'- for functional purposes here- Y isA pivotally connected at 54 with the valve proper, and the other` end of which forms an operating handle and preferably provided with a number of holes 55to any of which a suitable cord may be attached for operating the same from a distance.

Formed integrally with the casing'is a base-plate or plates 56 provided with bolt holes 57 by means of which the device as a whole may be attached to a Vpunch, press, or other machine, or in any place suitable for performing its functions.

vF rom the foregoing` description, itV willV be understood that the parts indicated by the; numerals 25,26, 27, 28, 29, 31, 32, 33,V

.34, 35, 36, 37, 38, 39, 4:1, 42, and eform the valve proper, withV the passage 30 and the chamber betweenV the cup. packings; the

parts enumerated beingV securely held together in the same relation to each other at all times during operation of the valve. rEhe valve has a-Xial reciprocating movement@ within the cylinder between two positions, one being shown in the full lines and the other in dottedoutlines. rIhe air-inlet portV 2O is located as to Vbe always in communication with the valve chamber between the two cup packings. VThe exhaust-port isvlocated so as to communicate Ywith the passage 30 j when the valve isin second position. The ports 22 are so located asto communicate with the passage 30 and exhaust port 21 when the valve is in first or normal position, and vwith the chamber between the packing cups vwhen the valve. is in secondV position, the shift being accomplishedby aXial Vmovement of the valve, thereby moving the adjacent cup packing 31 from one side to the other of the ports 22,

If the leather packing cups were required to slide .over Va comparatively large `opening in thecontiguous wall of the chamber, a

high-air pressure within the chamber would,

tend to force' theleather into suchopening, thereby tearing and Vwearing away the 'leather rapidly. In order to overcome this diliiculty and yet secure ample passage area,

we provide the-series of small circumferentially alined ports 22, and we iind the body of Ythe leather sufficiently rigid to withstand-pressing thereinto, and we find that Vthe packing moves over these smail'openings smoothly and vwithout wearing away there perceptibly more than elsewhere.V

Thepurp'ose of the spring 47 is to hold the valve in normal position ask shown in the full lines in the drawings, and to returnV it Atothat position; The purpose of the lever 53 Vis t0 shift the valve to its second Vposition. i

The valve `forms the' subject-matter ofa iis ' izo' separate application, Serial No.f4,121, ledV by us January 25,1915. y Q Y f Y Y Normally all parts are inthe positions shown the full lines in the drawings,

ist

inder communicates with the atmosphere;

and the valve chamber between the cup packings isiilled with air at line pressure.

. Upon operating the lever to shift the valve to its second position, the exhaust is cut olf from communication with the pressure chamber of the working cylinder and the air at line pressure is forced thereinto, moving the working piston to do its Work. Upon release of the lever the `parts are instantly restored to normal positions. In actual practice, the operation is ordinarily performed by giving the lever a .quick Vjerk and quickly releasing it, as the air does its work almost instantly, andprovision is usually made in the machine to which it is attached for restoring it, the machine, to its normal position ready for another phase or cycle of operation. However, we do not wish to be understood as coniining ourselves to the use of our device with such automatically restoring machines.

4Further to illustrate and explain the use of our trip reference is made to Fig. IV, in which 62 is a punch press such as is used for punching holes in boiler plates and other large work. 63 is the drive wheel, 64 represents the clutch mechanism, 65 is a trip rod connecting the clutch mechanism with the lever 67 which is pivoted to the frame at 66. Ordinarily this lever would be connected by means of a rod 68 with the foot lever 79 pivoted to the frame at 70, and such connection may be still maintained if desired, for use in case of the emergency of disconnecting the pneumatic trip. The pneumatic trip herein described is bolted to the frame, and the projecting end 10 of the piston rod is connected with an arm 72 depending from theV clutch lever. 71 is a boiler plateor other work in the position in which it is held ready to receive the tool. The cord 60 is passed over a pulley 6l fastened to the frame, and thence its free end may be led to the position most convenient for the workman handling the sheet. It will be noted Vthat by means of the cord, the single workman guiding the sheet may, from any position, easily trip the tool while holding the sheet. This is of importance'in considering the fact that such sheets are frequently of great size and Weight, it having been heretofore necessary, with the foot lever, to have another attendant at the foot lever down under the sheet.

Another valuable feature of our invention is the arrangement whereby the valve is balanced, there being no unequal pressures by the air upon different parts of the valve to force it or interfere with its free movement under influence of the spring and lever.

Another valuable feature is the close relation of the air under line pressure to the pressure chamber of the working cylinder, therebyeconomizing in air necessary to perform the functions of the device.

Another feature is that it is self-con tamed andV compact, thereby simplifying its manufacture and as well its attachment and use. And, in addition, it is simple, durable, strong, and readily accessible as to all its parts. i

58 is an oilcup. 'Ilhe lines 50 indicate the near ends of the iianges of the cup packings ywhen thevalve is in second position.

, Movement of the valve is limited by the head 26 striking against the casing end, and by the sleeve 4l striking against the collar 46.

Having thus described our invention, what We claim as new and desire to secure by Letters Patent is:

l. In a pneumatic trip, the combination of a casing integrally formed with a working cylinder, a valve chamber, a port connecting the cylinder and the chamber, inlet and exhaust ports for the valve chamber, a plate for attachment to a machine frame, and a pivot arm, said valve chamber being located at one end of the'working cylinder and at one side thereof; a piston and a piston rod in the working cylinder, said rod being formed for connection with clutchtripping mechanism, a spring for forcing the piston toward the end of the working cylinder at which the valve chamber is located, a valve in the valve chamber, and a lever pivoted to said pivot arm and a spring for operating said valve in opposite directions.

2. In a pneumatic trip, the combination of a casing formed with a working cylinder, a valve chamber, means for attachment to a machine frame, a pivot arm, and suitable ports; a piston in the working cylinder adapted to be moved in one direction by the motive fluid, a spring adapted to move the piston in the opposite direction, a piston rod secured to said piston and formed for attachment to clutch-tripping mechanism, a valve in said valve chamber for controlling the iiow of the motive fluid, and a lever pivoted to said pivot arm and a spring for operating the valve in opposite directions.

3. In a pneumatic trip, the combination of a casing formed with a working cylinder, a valve chamber, means for attachment to a machine frame, a pivot arm, and suitable ports; a piston and piston rod in the working cylinder, the piston rod being formed for connection with clutch-tripping mechanism, and the piston being adapted to be moved in one direction by the pressure fluid, means for moving the piston in the other direction, a three-way valve inv said valve chamber for controlling the flow of the motive fluid to and from the Working cylinder,

said valve normally opening said Working cylinder to the exhaust, a lever secured to the valve and pivoted to said pivot arm for operating said valve to direct the Huid under pressure into said Working cylinder and cut off the exhaust, and means for restoring said valve tonormal position.

4c. In a pneumatic trip, the combination oi' a casing formed withv a Working cylinder, a valve chamber, means for attachment to a machine frame, a pivot arm, and suitable ports; a piston and piston rod in the Working cylinder formed for connection With clutch-tripping mechanism, normally in non-tripping position, and operable to tripping position by the motive Huid, a three- Way valve in said valve chamber for con- Copies of this patent may be obtained for trolling the flow of the motive `fluid to and from said Working cylinder, said valve normally opening said cylinder to the exhaust, a lever secured to the valve and pivoted to the pivot arm for operating said valve to direct the fluid under pressure to the Working cylinder and cut ori' the exhaust, and springs for restoring the said movable parts to normal positions.-

In testimony whereof We have aiiXed our signatures in presence of two Witnesses.V

Witnesses: Y

C. J. ROSEN, Y.. J. M. STARK.

five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

